Devoid cards still have a color identity of whatever mana symbols appear on the card, much like how lands still have color identity - CR 903.4 for more information.
Yes, they have to have only numbers. Commander color restriction is based on the color identity of cards which count the physical symbols of WUBGR you see on the cards (in both mana cost and text box), no matter what the card says about itself.
Why so? It's for aesthetic reasons. Restrictions based on aesthetic and flavour is part of the philosophy of the format.
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Why so? It's for aesthetic reasons. Restrictions based on aesthetic and flavour is part of the philosophy of the format.